title: Three-stage Fabry-Perot liquid crystal tunable filter with extended spectral range.
abstract: A method to extend spectral range of tunable optical filter is proposed in this paper. Two same tunable Fabry-Perot filters and an additional tunable filter with different free spectral range are cascaded to extend spectral range and reduce sidelobes. Over 400 nm of free spectral range and 4 nm of full width at half maximum of the filter were achieved. Design procedure and simulation are described in detail. An experimental 3-stage tunable Fabry-Perot filter with visible and infrared spectra is demonstrated. The experimental results and the theoretical analysis are presented in detail to verify this method. The results revealed that a compact and extended tunable spectral range of Fabry-Perot filter can be easily attainable by this method.
authors.affiliation: State Key Labaratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China.
authors.forename: Zhenrong
authors.initials: Z
authors.lastname: Zheng
authors.forename: Guowei
authors.initials: G
authors.lastname: Yang
authors.forename: Haifeng
authors.initials: H
authors.lastname: Li
authors.forename: Xu
authors.initials: X
authors.lastname: Liu
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D050866:Liquid Crystals / Q000737:chemistry*; D055096:Optical Devices; D012031:Refractometry / Q000295:instrumentation*